/Engine/Source/Runtime/Core/Public/GenericPlatform/GenericPlatformMemory.h
Copies count bytes of characters from Src to Dest. If some regions of the source area and the destination overlap, memmove ensures that the original source bytes in the overlapping region are copied before being overwritten. NOTE: make sure that the destination buffer is the same size or larger than the source buffer!
static void * Memmove ( void * Dest, const void * Src, SIZE_T Count )